Django OAuth Toolkit allows to separate the Authentication Server and the Resource Server.
Based on the RFC 7662 Django OAuth Toolkit provides
a rfc-compliant introspection endpoint.
As well the Django OAuth Toolkit allows to verify access tokens by the use of an introspection endpoint.

Setup the Resource Server like the Authentication Server as described in the tutorial.
Add RESOURCE_SERVER_INTROSPECTION_URL and eitherRESOURCE_SERVER_AUTH_TOKENorRESOURCE_SERVER_INTROSPECTION_CREDENTIALS as a (id,secret) tuple to your settings.
The Resource Server will try to verify its requests on the Authentication Server.

OAUTH2_PROVIDER={...'RESOURCE_SERVER_INTROSPECTION_URL':'https://example.org/o/introspect/','RESOURCE_SERVER_AUTH_TOKEN':'3yUqsWtwKYKHnfivFcJu',# OR this but not both:# 'RESOURCE_SERVER_INTROSPECTION_CREDENTIALS': ('rs_client_id','rs_client_secret'),...}

RESOURCE_SERVER_INTROSPECTION_URL defines the introspection endpoint and
RESOURCE_SERVER_AUTH_TOKEN an authentication token to authenticate against the
Authentication Server.
As allowed by RFC 7662, some external OAuth 2.0 servers support HTTP Basic Authentication.
For these, use:
RESOURCE_SERVER_INTROSPECTION_CREDENTIALS=('client_id','client_secret') instead
of RESOURCE_SERVER_AUTH_TOKEN.